Merge pull request #349 from TheRyuu/master

lame: Use joint stereo
Start sound playback in MMDeviceAudioSource::Reinitialize
Fixes issues where the desktop device would drop and reacquire then stop providing audio due to no audio being played, causing OBS to freeze and break horribly.
Rebuild libx264 using GCC
The MSVC builds lacked inline ASM support and were slower :(
Hide bit-version for 32 bit OBS to avoid confusion